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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9560573bd1247116139e5c82c2a697baee955b48144d53913b64e22a7ad02edc' 
  AND token = 'jcTLHDriozg5rGT+5Hc5NvkTiVb8tLgTPUwYaN17NHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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