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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1afd0df47bd72716c07417cbe9a55e80e950f8ded9f528575c950dea143e1113' 
  AND token = 'C9xzFA+BO5y2j9mAY+JaB0CSn5Adf4pJpq+VDx+sUZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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