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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '778d648966da58a2b288eaff400bd2b80d7c520a6c736060230a39d1a18da975' 
  AND token = 'N2JHeu2JR6NTUvXyFJtn8UyvzTjHvG80qctRuAL1QZc=' 
  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"
    }
  }
}