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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83f3cf1c36a962ffc75d9a9495e5f5c9ed1fb3e925068f7609ec45488ca1366' 
  AND token = 'JZFsCV+npJvlacVhkOB6WZ1kFgdDKEGb8LtErt4t1xg=' 
  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"
    }
  }
}