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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da4e5f6f302619b83ac4108241663dcc8cfa87ddd5e3ae6119387328ad5e1bfe' 
  AND token = 'FUNzKYFcG9qKdY7xjLYWMkXt1OcWo7nXWakDD0WJGhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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