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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b161f04858c6922bf28ddc247d43f387982ebd452a731ec5c877eac18c32461' 
  AND token = '6H0LlaE+6y/5Jr9zi7r4Rt1o8WS7dv2VKCrv+39HMlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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