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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa912c266d2e5b6715812f72af24ce8d1c4a14e49b742d72b7246b4610ce9097' 
  AND token = 'xmIdvYiqP2uP+RgWFi38fO101ymhxza6Y44bIYHa/jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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