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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c844848e35bbaa4a354082b44a8fdca1ec0914c8c2f99885fbca28800f649d' 
  AND token = 'tq/r6/yMiqS7e+m2nj/yOxMN/qui++YD3Pn/8roEwyo=' 
  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"
    }
  }
}