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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a74a83208cf3ead71fb4695773cedc6d1c140b1389ebe48fe4d49ef0107a6037' 
  AND token = 'RqwV41d9SSwT3PJaWWMz8f/l+MEIO9AaTxNtpTN9fWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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