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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27340d6e34a3434db71da9ce639d9467e57b30ca47a7465b466014cfe2cc6dc5' 
  AND token = '4qwNHdrhXSDfKwCjZ/+t+wVDhhdLKpELgfrh9INxCsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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