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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8825c748ec5d090ad2b747404db5510d011defc0ef2ea6c78b409477cac107c4' 
  AND token = 'mGOUGT1pHiQfpxGMwXlOga2pHRGUw3lGw7f9x49xocE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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