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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0317f0e75e16b8da504cd10bc32b0f3352fbcaadd7fe5b68e90c77027c52f72' 
  AND token = 'bBUnG9IyKYbsD0hytOwmWiQcl7H6+KSPa6Ea7q2Luk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}