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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8eecfcd1af6d74e1fdd764251d76c70d9726caf49f1999843757b4cf0fb5c72' 
  AND token = 'ej1rI4XdJh+Gkl7WsNF8lBVu6Hlx2IjMM98icuaZpTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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