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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3570bd458ebd5b9e76bcd81dda2b0103453afbc313d7e97dcb89d7374d85f2b2' 
  AND token = 'G4GxjOqNPT/26ZHxF/WpQrrfd+JCJU3NbLCw2ADMewM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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