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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b749f0bb8b188dd63fe877e0e45d3c89bdf5c15e72ca61a9fbbba0481d5f98b9' 
  AND token = 'nFb55BxEh8eofFuq9J5Tiq/DEkDM1zN+3ok4WsivC7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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