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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cf23aa688433ee2b63e499904ac7862592d77f76b748e96a38638a0f28e7c2c' 
  AND token = 'cpU9D+eDj0OOJiOY6WowV4dU3Z0xFvWO4R4MXk6esx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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