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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68637fad6ca0c5c59eb0d1f7245105f62d4fa038e48d3cc907072f717dc84ddf' 
  AND token = 'd4o+CfraMk9/U3PwsR5u1znyOOBX1qYAcJ5ySRi4Q2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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