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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2603d0e286ec4fef0f610a3e5e90145128bcb988218da063bba5facf27f2661d' 
  AND token = '668w5BMFtZq7HzOkxszNpT3iGg+95th/339KWY19h0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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