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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6064772fd8d16041dbda0a308c648026a4f54ce856b6444ddc47798c091398cf' 
  AND token = 'yOShMrsM3yAL+fySJRP8pqGazjnGl4hamp5B1mCdGB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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