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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b19a17c05b4ec39d629aa819031cf7f78ae71c196afe6b98c6921a4fc92324' 
  AND token = 'QmxctmF+Evz48GcHghaBqyfXONSt05fetrEAvNabigI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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