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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb3b87ae6843390928c5c879a8bc76e7d88c6ec41ff6805bc907e7511ea223a6' 
  AND token = 'XvW7EZU5s/Ld5MD7R7LUr+4c84voMBtOb6kf1w+ogQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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