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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '436a874af45dd7540c656c07fad79da5a4d02fd621ec808bf5453cf4b65620d1' 
  AND token = 'aCpTqkf7+DuZJwp8E9LdR0X3t5QOsWbze58remzrlBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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