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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c708cd4bd9bf1f92b920f272112d1907f964963caef4d52e2eac7b9e5f8b56a9' 
  AND token = 'v1CYnPD/ON2Z15h3Igh+YPsdheMiK1WbYlpuw9aFmXA=' 
  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"
    }
  }
}