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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df81bf1ef272a451007f2068f57db7b72b71f6d1df8ac85bbb9231c5f4c81490' 
  AND token = '1nJ+XWGbSDju8aShRkyHzb3+5rHL9t8Wro0N0qGOpYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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