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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a976b97e9759a49083a390e364125cf282bb9e5255750e2c0ca40a907eabdbeb' 
  AND token = 'ccdqV0lkLXyAy/Cqi/T/NPf8Q+q8ZzgI5ZC3g4QfSUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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