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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff16ff92bf43b170232f32bcfec8be5d76d4aa0784ad7552e21dc76d2941ae66' 
  AND token = 'j4CHa+w+TVaT0+3NceG+sXQWydCZ10YVHqGSAMFyf1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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