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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aabcd9d6d8e5fd0fd2425b75eeae9b1e97adbe683a37e524bfc0fc5cbd0b7e53' 
  AND token = 'nTrJds4qEuuxxBdvgUw0A7NoJuDC7UI1QhFyBUT7owM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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