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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa678bf17c227385645c3dfb685845e208c8a7f8bd9664097baee38d7ea0c17e' 
  AND token = 'r9tXYp7PSW4EG6yWm8FWEmfD2jDgid8C7UdzN6mOnAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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