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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f567bff87a68180f49a1ec85cd0fcef0c939d6ce7ba13d691c04524a1c5c6da' 
  AND token = 'KXfxAM/tIUiSzZUAv/2/JgFuiR89Pss/bc1ZRSThjpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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