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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3522d1817e9c4e29210fbe1b591295eaa2308d8a02de8e25a9535378c6d4e0e' 
  AND token = 'UtGzLC9pNqtYyQjINxI+fImtc0X8u4vwglBS+nLf4mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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