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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773abf28d2de4b1701d5c2ff0e8468b2efab4786038fd5925b77f144a6171748' 
  AND token = 'I3FfTuGwFELisBxq39a1m6l0M+uvK99v0lM0vVujO28=' 
  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"
    }
  }
}