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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f1c86468672449c8da2e78008ef99f8959810d7b27600d60e6ed7f99cfb8bed' 
  AND token = 'ggvSqOHNekb40LRrXA8qpWMeeLKitXJZkX+ipYH9nRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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