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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec5771dfd233c69a8e1460ee0f2669f8cc0fd6158119357cf30253813e3a8fb' 
  AND token = '2yzPTRsNuqavBhVIfcc6yZ7qr+yUXQJMNpNPCUOixLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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