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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9d28efac4516e38537ec4cf093ff2bc817f188b5a5da4d5977c225dc697d1b' 
  AND token = 'Q756sPHpSFG3q7bHFT4nT4V9BJnXkZRGCLz5ax2SYsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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