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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd76831bf294a64479cf451d0118cc04a50e9550eee1b5a9f0b10b257a011b94' 
  AND token = 'Km6Zb1NcyFTJxMwNOkUtQisSxVbir/Z7dirXWD6ETXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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