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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '171ae5509b9dbf3d2a4b6bc51d8b3fb40d8edef2f51ece8ba236909b19e07168' 
  AND token = 'Ho4wyijP0kcytz1dYF7hM1ldap7rFUggmqvicJ1JZII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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