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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca30dcc68069dcb428144a3bf33f85b477717edbe965101d02b5088b27321d4' 
  AND token = 'EbDlypje58QKOS/odGCnTu5If2KLrXmmzWOZ9AbYr/0=' 
  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"
    }
  }
}