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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b0bd1656c3af1cb0570be34fe2f4c7ffdac7ef3f3eff37f54d6773260338ca1' 
  AND token = 'GH6M05WEGWXs11f543JZ28Zlo95Bd2r5NAsDs+F7PKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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