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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a490039cc1a85cc4b9793e94aeec06c0e3531821654679c8157a3cea32575afc' 
  AND token = 'm6jCh9M60rqV7f15c4F7KP9WJR+NrFEHZRmkoTB2jv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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