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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f59b380184dfbbde28ed78d414080e11d7e84dfb9fbb764af1e13dc5483e2526' 
  AND token = 'BnU7fThl0LgGqRz1Xj9zqOSVML2chvdsy2EZ6IFc7rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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