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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700898a252e917410c65a4dbc727ba83436eb1400ebe3d3e90d2a0da5a9ad734' 
  AND token = 'k9fUcuxo7c+RCDRaxkgVzyPosuZ94F2KkKjJpYvb1Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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