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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd953c1b78caa20c0316f1224b67c94b1f780385268d04c37ca30affd14380fad' 
  AND token = 'Dl41X5++4HWnP1Q6ffAWVg+nMeUs2vMVSOwDTThJyiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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