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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '559206e8be5d2c9be27b84fc283c256c2c4dd1f7cb5787d21f8d058f55618be9' 
  AND token = '4KOVCOCCOxnoUb/XBshpj/mT5+s+WH3M5B3bjMLQ1NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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