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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5643c1cc1ac6f3d371338e4f3a0cf0ae66694352a119e7bf2936c3e2e2511650' 
  AND token = 'ejvHzK/8a8TJl1q1Ac9gsRzuARojHmddiFptetClRdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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