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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c99338afaabbff3f9bcf6d8febf1eb523a104a93880c3e67a7e7c0dc6547a5' 
  AND token = 'u1dk8Q40waReoAbteVI+DTYtD7Q2P99qGDrFnGDEsKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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