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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3464a78725b4febdfccd54fd4a4a19b437ef0d129ce8ee1699b10e8145be7872' 
  AND token = 'hUDGQHO2nOY8NZWGPbhmCfwdYm7uHruROOW1ci+/QXw=' 
  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"
    }
  }
}