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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020c717cf2d495e53c28cb5258b5b52580df898164997c14d5469ebfe7c07564' 
  AND token = 'DMKV7fAzOlL/UhN3azUKe1Ad4g91mkCargq7CO4YseQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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