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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aca71210641c6ad155752e8556e7e0ac2ba6c00406b0ea2a07767f19970e8869' 
  AND token = 'B+sxFVyyd9bb050Lk3OmJlU32fXkiI49A/x8xftpCnU=' 
  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"
    }
  }
}