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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1841f069900ba53b919dc4100e379781e72e284d67e4f6bd6858581b1fca4fb5' 
  AND token = 'e0s2tIog0hBcHPM/u+T/RZr9CdQarJ48IeoaS+wwDY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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