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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce1a952ad69c2789acdd13ff718836c3d30896b6059533afe356790732e7d05' 
  AND token = 'cV7Oyrl1DvX3NwKQq1t5vaT1sbWBlpediqm6aRdd7Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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