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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca639ccbc0b4bc16c23c6498140bf936ba09fa6491651000b13d6be9b2deefb' 
  AND token = 'e9TV8eGGUBpsMvWYVVYIZxxWIaPN6alVU8yzr/WZAnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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